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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 10 |
| 5 | 84 |
| 6 | 724 |
| 7 | 6516 |
| 8 | 60900 |
| 9 | 586404 |
| 10 | 5777916 |
| 11 | 57952212 |
| 12 | 589381020 |
| 13 | 6060195316 |
| 14 | 62863155972 |
| 15 | 656765033268 |
| 16 | 6902094928308 |
| 17 | 72892778268996 |
| 18 | 773013952508268 |
| 19 | 8226672021670804 |
| 20 | 87817595880192684 |
[1,10,84,724,6516,60900,586404,5777916,57952212, 589381020,6060195316,62863155972,656765033268, 6902094928308,72892778268996,773013952508268, 8226672021670804,87817595880192684] |